Every now and then I’ll run into an issue with a website’s uploader. They ask me to upload a picture, but then when I click their upload button, none of my pictures appear in the dialog. After troubleshooting for a few, it turns out that they’re limiting file masks to [*.jpg, *.jpeg, *.bmp, *.png] etc. But — because I copied my pictures over from a windows installation, they have all-capital file extensions. Linux uses a case-sensitive file system, so it regards these as different. Renaming a file to a lowercase extension [*.jpg] caused it to show up in the dialog which is what I wanted — but manually renaming thousands of pictures in dozens of directories was out of the question.
I could have written a bash script to do the renaming in a few minutes but I found something better — convmv. This simple utility makes filename conversions / renaming a breeze. By default, it runs in ‘test’ mode so that you can see what will happen before it does the job.
For my case, I needed to rename all the files to lowercase, so I used:
convmv --lower *
That showed me a verbose listing of everything it would do (test mode). However, I wanted to do the entire Pictures folder and everything under it. The new command from my Pictures folder became:
convmv --lower -r *
To get it to actually do the job, I had to specify
--notest as well.
convmv --lower -r --notest *
It did it’s work within seconds and everything was lowercase. In my opinion, much easier and better than a bash script.
Convmv has plenty of other options, so next time you need to do filename conversion, check it out.
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